150 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOYY. 



capture that species as well as others at depths of 

 from 50 to 100 fathoms. We may assume that the 

 herring, when their time of feeding comes, go where 

 they will be abundantly supplied with food ; and 

 therefore, if the difficulty be not too great, there 

 can be little doubt that the herring would be 

 obtained there after they had left the ground from 

 whence they are usually fished. 



On some Marine Mollusca. 



[Read 26th April, 1887.] 



Of the shells which I now bring under your notice 

 as rare or doubtful inhabitants of British waters, 

 the most doubtful and least known was taken from 

 the stomach of a Long - tailed Ice - Duck (Harelda 

 glacialis, Lin.). The bird was killed in Sls^e, and 

 given by the late Dr. Dewar to Mr. M'Culloch, 

 Glasgow, to be skinned. On being opened it was 

 found to contain a large quantity of shells, all 

 Lacuna divaricata with the exception of the one 

 under notice. As this remarkable shell Avas quite 

 unknown to me, I sent it to the late Dr. Gwyn 

 Jeffreys, who at once pronounced it to be Cyclope 

 neritea, a Mediterranean species. Taking all the cir- 

 cumstances into account, particularly the northern 

 habitats both of /fare/da glacialis and Lacuna 

 divaricata. Dr. Jeffreys acknowledged the pro- 

 bability to be very small indeed that the shell 

 had been picked up by the Ice-Duck on the shores 

 of the Mediterranean and carried thence in its 

 stomach all the way to the North - West of Scot- 

 land, where the bird was shot. Still he had a 

 lingering reluctance to admit the species as British 

 on the evidence of a single specimen. No more was 

 thought of the occurrence till last summer, when 

 one of my grandchildren found another specimen 

 of the same species at low- water in Karnes Bay, 

 Millport. The shell was empty when found, but 



